My spoken English has since I came to this school in August.My spoken English has ( )since I came to this school in August.A.raised a lot B.been improved a lot C.raised a lot of D.improved a lot为什么选D?

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My spoken English has since I came to this school in August.My spoken English has ( )since I came to this school in August.A.raised a lot B.been improved a lot C.raised a lot of D.improved a lot为什么选D?
My spoken English has since I came to this school in August.
My spoken English has ( )since I came to this school in August.A.raised a lot B.been improved a lot C.raised a lot of D.improved a lot
为什么选D?

My spoken English has since I came to this school in August.My spoken English has ( )since I came to this school in August.A.raised a lot B.been improved a lot C.raised a lot of D.improved a lot为什么选D?
raise是及物动词,必须有宾语,所以A和C排除
improve可以作不及物动词,指“改进.改善”,没必要用B被动语态
所以是D

D